I saw this movie yesterday. I believe that Portman really nailed the essence of Jackie Kennedy, both as a debutante and historian.
Quick Google search:
"A searing and intimate portrait of one of the most important and tragic moments in American history, seen through the eyes of the iconic First Lady, then Jacqueline Bouvier Kennedy. JACKIE places us in her world during the days immediately following her husband's assassination. Known for her extraordinary dignity and poise, here we see a psychological portrait of the First Lady as she struggles to maintain her husband's legacy and the world of "Camelot" that they created and loved so well."
One week after JFK's assassination Jackie granted an interview to a reporter that later published in life magazine. I had no idea that it was this story that spun the myth of the Kennedy administration as a modern day Camelot.
I enjoyed the movie, but I'm glad I didn't pay for it. It almost felt too intimate, like I was eavesdropping where I shouldn't. Also, I'm not sure how much of it really happened. I was only three years old then. But I did get to listen to my SO tell me conspiracy theories all through the movie.
"Did you know one guy reportedly witnessed Johnson throatfucking Kennedy's corpse?"
NO NO NO NO NO! I don't want to hear that!